planner: introduce hashEqual interface for datum.

[AilinKid]

What problem does this PR solve?

Issue Number: ref #51664

Problem Summary:

What changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

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None

[tiprow]

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[codecov]

Codecov Report

Attention: Patch coverage is 72.72727% with 12 lines in your changes missing coverage. Please review.

Project coverage is 74.6436%. Comparing base (4f85a35) to head (78dc3a7).
Report is 11 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #55727        +/-   ##
================================================
+ Coverage   72.8618%   74.6436%   +1.7818%     
================================================
  Files          1582       1582                
  Lines        442708     443983      +1275     
================================================
+ Hits         322565     331405      +8840     
+ Misses       100322      92268      -8054     
- Partials      19821      20310       +489     

Flag	Coverage Δ
integration	48.9649% <4.5454%> (?)
unit	71.8731% <72.7272%> (-0.1101%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	52.9567% <ø> (ø)
parser	∅ <ø> (∅)
br	52.0825% <ø> (+6.6446%)	⬆️

[AilinKid]

passing hasher into every encoding logic of datum field means we need to mutate many codec functions, which is dirty.

here we just choose to let hasher ingest datum.HashCode() bytes to make it. See the Line 1606

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hawkingrei, winoros

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-29 06:34:09.898128347 +0000 UTC m=+1024845.032578468: ☑️ agreed by winoros.
• 2024-08-29 08:50:43.025785709 +0000 UTC m=+1033038.160235830: ☑️ agreed by hawkingrei.

[tiprow]

@AilinKid: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
fast_test_tiprow	78dc3a7	link	true	/test fast_test_tiprow

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